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Forum Discussion
CM1150v Intermittent Slowness and Channels not locking
Hello, Having an issue where the CM1150v modem I have went from perfectly fine to all of a sudden flashing the downstream light repeatedly. My speeds went from 300+ to about 20-30mbps. It's been ...
The reason I think its the cable or how you've split the signal on the cable is, for the most part, modems either work or they don't. There's not a whole lot of in-between when they go bad.
You must have coax where the modem is. But you have a bunch of devices connecting in between where the cable comes in and where the modem is. Remove them and just run a direct connector (https://www.amazon.com/Connector-VCE-Extension-Adapter-Connects/dp/B01F54KYO2?ref_=fsclp_pl_dp_1) without the splitters/amplifiers/etc. See if it works then. The cable company is only required to get a good signal to your house. After that, if you add a bunch of splitters/moca adapters/poor/cheap cables then its on you and they aren't required to do more.
So your goal is to see if it works when it enters your house. If it does, it isn't the modem or the signal coming in, its everything you introduced after it enters your house.
They put in all and any splitters that are in the home to ensure service is provided to their equipment in the rest of the home. All of the splitters or amplifiers are theirs and they put them in. I am still in contact with them to try and figure this out but I was curious if it was something known on the modem as I saw that speeds were dramatically decreased with LAG enabled on this firmware. (It is disabled on mine, but I would like to enable it.)
I will try and figure out getting a direct line going to the modem, but like I said, all the splitters and adapters are all Comcast's equipment that they put in. They guarantee the service to all the devices in the home, and that's how they acheieved it. Like I said though, this setup had been working alright for quite some time now and it just started acting up a week ago.
GSquared wrote:They put in all and any splitters that are in the home to ensure service is provided to their equipment in the rest of the home. All of the splitters or amplifiers are theirs and they put them in. I am still in contact with them to try and figure this out but I was curious if it was something known on the modem as I saw that speeds were dramatically decreased with LAG enabled on this firmware. (It is disabled on mine, but I would like to enable it.)
I will try and figure out getting a direct line going to the modem, but like I said, all the splitters and adapters are all Comcast's equipment that they put in. They guarantee the service to all the devices in the home, and that's how they acheieved it. Like I said though, this setup had been working alright for quite some time now and it just started acting up a week ago.
Comcast doesn't guarantee anything once it enters the house unless you're paying some type of home service plan (not even sure if they offer that). They might help you out to get the tv working because its their signal but unless you use their modem, they don't care how they degrade the signal going to a 3rd party modem because they aren't responsible for it.
And with your errors in your line and if they've truly said they won't come look without your replacing it, you're kind of limited. Here's your options.
1. try the direct wire solutions and see if it fixes the problem. If it does, its the way the line has been split and comcast just doesn't care.
2. replace the modem either by going through netgear to see if they'll authorize an RMA (if you're within warranty) or just buying a new one. If it still has the issues, comcast can't continue to blame it on the modem.
3. Rent a modem from comcast for a month. If you get the same poor signal on their equipment, they can't blame in on netgear and will need to fix the signal. its usually $10-15 to rent. Some modems are more sensative to less to poor signal so even if it works, get a screen snip of the connections page for errors/signal strength.
Was this resolved for you? I am having the same exact problems you describe here except I don't believe our signal is being split before the modem connection. We also used to have Comcasts all-in-one modem/router before we switched over to this new setup. When we had that there was intermittent service from them but it wasn't as frequently down as it is now. Before I'd have to call in to Comcast to have the signal resent maybe every 2 weeks.
Were using Google mesh system as a router. We have 3 of those. For the first 2 weeks the whole system was up and running and we had the fastest internet I've ever experienced. Now same problem you are having, intermittent service or no service at all. I have to have Comcast resend the signal every day now.
Same exact thing you describe above. The Comcast tech comes out. Everything checks out. They leave and something goes down a few hours later. Yesterday the tech left and for the first time my main phone line went down but we had internet. Usually its the internet that goes down after they leave. I wake up this morning and no internet. Restart the CM1150v and now internet is back but very slow. I've had a Comcast tech out 3 times in the past 2 weeks.
I'm not an expert but I don't think the CM1150v is playing well here. It appears other people are having the same problem. If this is a Comcast "recommended" modem why can't Netgear or Comcast figure this one out? We're wasting our time troubleshooting. This is so frustrating. I work from home so this is costing me money every day.
suspen wrote:Was this resolved for you? I am having the same exact problems you describe here except I don't believe our signal is being split before the modem connection. We also used to have Comcasts all-in-one modem/router before we switched over to this new setup. When we had that there was intermittent service from them but it wasn't as frequently down as it is now. Before I'd have to call in to Comcast to have the signal resent maybe every 2 weeks.
Were using Google mesh system as a router. We have 3 of those. For the first 2 weeks the whole system was up and running and we had the fastest internet I've ever experienced. Now same problem you are having, intermittent service or no service at all. I have to have Comcast resend the signal every day now.
Same exact thing you describe above. The Comcast tech comes out. Everything checks out. They leave and something goes down a few hours later. Yesterday the tech left and for the first time my main phone line went down but we had internet. Usually its the internet that goes down after they leave. I wake up this morning and no internet. Restart the CM1150v and now internet is back but very slow. I've had a Comcast tech out 3 times in the past 2 weeks.
I'm not an expert but I don't think the CM1150v is playing well here. It appears other people are having the same problem. If this is a Comcast "recommended" modem why can't Netgear or Comcast figure this one out? We're wasting our time troubleshooting. This is so frustrating. I work from home so this is costing me money every day.
We're more than willing to help you troubleshoot but you need to start your own thread. We try to focus on a single person's problem to keep things from being confusing as well as each situation is unique and requires different details/approach. Again, please start your own thread so we can help you.
When you start it list:
Modem speeds you pay for
Speeds you get hardwired
Screen snip of your modem connections page
router and firmware
What exactly is happening. Not just signal drops. Do wireless and hardwired, what fixes it, what is your wiring layout, etc. The more details the better.
- Same problem here with a CM1100 and Comcast. 2.01.02 firmware. No signal splitter. My 250 Mbps connection drops to about 30 Mbps until I reboot the modem.
Have you had the ISP check the signal and line quality up to the modem?
Might contact NG support and have them review any debug logs from when this happens.
coldcaffeine wrote:
Same problem here with a CM1100 and Comcast. 2.01.02 firmware. No signal splitter. My 250 Mbps connection drops to about 30 Mbps until I reboot the modem.Haven't had a chance to try the modem directly on the line that comes into the house (in the attic), but that still would be completely unreasonable to not be able to have internet service and TV service at the same time -- a splitter is neccessary to provide this and has worked for years, including months with this modem. (And they just replaced this piece when there for this service call) It just happened all of a sudden 2 weeks ago that the downstream light started flashing and speeds dropping. Not sure if firmware related or Comcast line related or what. They tested all the lines all the way up to the modem. It's just so itermittent that I don't know how to tell anyone from Comcast how to see it since it's working for a day, then not for a day or working for a morning, then not at night. It's completely random.
This is still happening to me, the downstream light flashes and the speeds drop. The light stops flashing and the speeds go right back up.
I'll try to report back after I have a chance to test it on the line coming into the house when the problem is occuring.
:smileywink:
